The AMS Neve 8801 ADC option board has 2 sync inputs, AES 3 on a female XLR and Word Clock on a BNC. optional card for the 8801 Channel Strip from AMS Neve
If neither sync input is present, the unit will synchronise to its internal clock.
If either of the sync inputs is present at the sampling frequency displayed on the front panel, the LED (AES or WCLK respectively) will illuminate green showing that the sync input is being used as a reference.
If the incoming sync sample rate differs from the sample rate displayed on the front panel, the WCK or AES LEDs will flash..
If both sync inputs are present and correct the word clock input will be used as the reference and the AES LED will flash.